how old are you?
have you had acne before 6 months?
is this skin problem elsewhere other than your cheeks?

26
Nothing like this before
It's also on the left side of my forehead

Your diet may be a factor. Also if you are in moist surroundings (hot weather) this may contribute to acne formations.

Are you stressed out during the days, excercise, lack of sleep etc., any of these things may cause the blemishes as well.